/*
 * Copyright 2017 ~ 2025 the original author or authors. <wanglsir@gmail.com, 983708408@qq.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wl4g.devops.dguid.baidu.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

/**
 * DockerUtils
 * 
 * @author yutianbao
 */
public class DockerUtils {
	private static final Logger LOGGER = LoggerFactory.getLogger(DockerUtils.class);

	/** Environment param keys */
	private static final String ENV_KEY_HOST = "JPAAS_HOST";
	private static final String ENV_KEY_PORT = "JPAAS_HTTP_PORT";
	private static final String ENV_KEY_PORT_ORIGINAL = "JPAAS_HOST_PORT_8080";

	/** Docker host & port */
	private static String DOCKER_HOST = "";
	private static String DOCKER_PORT = "";

	/** Whether is docker */
	private static boolean IS_DOCKER;

	static {
		retrieveFromEnv();
	}

	/**
	 * Retrieve docker host
	 * 
	 * @return empty string if not a docker
	 */
	public static String getDockerHost() {
		return DOCKER_HOST;
	}

	/**
	 * Retrieve docker port
	 * 
	 * @return empty string if not a docker
	 */
	public static String getDockerPort() {
		return DOCKER_PORT;
	}

	/**
	 * Whether a docker
	 * 
	 * @return
	 */
	public static boolean isDocker() {
		return IS_DOCKER;
	}

	/**
	 * Retrieve host & port from environment
	 */
	private static void retrieveFromEnv() {
		// retrieve host & port from environment
		DOCKER_HOST = System.getenv(ENV_KEY_HOST);
		DOCKER_PORT = System.getenv(ENV_KEY_PORT);

		// not found from 'JPAAS_HTTP_PORT', then try to find from
		// 'JPAAS_HOST_PORT_8080'
		if (StringUtils.isEmpty(DOCKER_PORT)) {
			DOCKER_PORT = System.getenv(ENV_KEY_PORT_ORIGINAL);
		}

		boolean hasEnvHost = !StringUtils.isEmpty(DOCKER_HOST);
		boolean hasEnvPort = !StringUtils.isEmpty(DOCKER_PORT);

		// docker can find both host & port from environment
		if (hasEnvHost && hasEnvPort) {
			IS_DOCKER = true;

			// found nothing means not a docker, maybe an actual machine
		} else if (!hasEnvHost && !hasEnvPort) {
			IS_DOCKER = false;

		} else {
			LOGGER.error("Missing host or port from env for Docker. host:{}, port:{}", DOCKER_HOST, DOCKER_PORT);
			throw new RuntimeException("Missing host or port from env for Docker. host:" + DOCKER_HOST + ", port:" + DOCKER_PORT);
		}
	}

}